1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2017-2018, The Linux Foundation. All rights reserved.
3
4 /* Disable MMIO tracing to prevent excessive logging of unwanted MMIO traces */
5 #define __DISABLE_TRACE_MMIO__
6
7 #include <linux/acpi.h>
8 #include <linux/clk.h>
9 #include <linux/slab.h>
10 #include <linux/dma-mapping.h>
11 #include <linux/io.h>
12 #include <linux/module.h>
13 #include <linux/of.h>
14 #include <linux/of_platform.h>
15 #include <linux/pinctrl/consumer.h>
16 #include <linux/platform_device.h>
17 #include <linux/soc/qcom/geni-se.h>
18
19 /**
20 * DOC: Overview
21 *
22 * Generic Interface (GENI) Serial Engine (SE) Wrapper driver is introduced
23 * to manage GENI firmware based Qualcomm Universal Peripheral (QUP) Wrapper
24 * controller. QUP Wrapper is designed to support various serial bus protocols
25 * like UART, SPI, I2C, I3C, etc.
26 */
27
28 /**
29 * DOC: Hardware description
30 *
31 * GENI based QUP is a highly-flexible and programmable module for supporting
32 * a wide range of serial interfaces like UART, SPI, I2C, I3C, etc. A single
33 * QUP module can provide upto 8 serial interfaces, using its internal
34 * serial engines. The actual configuration is determined by the target
35 * platform configuration. The protocol supported by each interface is
36 * determined by the firmware loaded to the serial engine. Each SE consists
37 * of a DMA Engine and GENI sub modules which enable serial engines to
38 * support FIFO and DMA modes of operation.
39 *
40 *
41 * +-----------------------------------------+
42 * |QUP Wrapper |
43 * | +----------------------------+ |
44 * --QUP & SE Clocks--> | Serial Engine N | +-IO------>
45 * | | ... | | Interface
46 * <---Clock Perf.----+ +----+-----------------------+ | |
47 * State Interface | | Serial Engine 1 | | |
48 * | | | | |
49 * | | | | |
50 * <--------AHB-------> | | | |
51 * | | +----+ |
52 * | | | |
53 * | | | |
54 * <------SE IRQ------+ +----------------------------+ |
55 * | |
56 * +-----------------------------------------+
57 *
58 * Figure 1: GENI based QUP Wrapper
59 *
60 * The GENI submodules include primary and secondary sequencers which are
61 * used to drive TX & RX operations. On serial interfaces that operate using
62 * master-slave model, primary sequencer drives both TX & RX operations. On
63 * serial interfaces that operate using peer-to-peer model, primary sequencer
64 * drives TX operation and secondary sequencer drives RX operation.
65 */
66
67 /**
68 * DOC: Software description
69 *
70 * GENI SE Wrapper driver is structured into 2 parts:
71 *
72 * geni_wrapper represents QUP Wrapper controller. This part of the driver
73 * manages QUP Wrapper information such as hardware version, clock
74 * performance table that is common to all the internal serial engines.
75 *
76 * geni_se represents serial engine. This part of the driver manages serial
77 * engine information such as clocks, containing QUP Wrapper, etc. This part
78 * of driver also supports operations (eg. initialize the concerned serial
79 * engine, select between FIFO and DMA mode of operation etc.) that are
80 * common to all the serial engines and are independent of serial interfaces.
81 */
82
83 #define MAX_CLK_PERF_LEVEL 32
84 #define MAX_CLKS 2
85
86 /**
87 * struct geni_wrapper - Data structure to represent the QUP Wrapper Core
88 * @dev: Device pointer of the QUP wrapper core
89 * @base: Base address of this instance of QUP wrapper core
90 * @clks: Handle to the primary & optional secondary AHB clocks
91 * @num_clks: Count of clocks
92 * @to_core: Core ICC path
93 */
94 struct geni_wrapper {
95 struct device *dev;
96 void __iomem *base;
97 struct clk_bulk_data clks[MAX_CLKS];
98 unsigned int num_clks;
99 };
100
101 /**
102 * struct geni_se_desc - Data structure to represent the QUP Wrapper resources
103 * @clks: Name of the primary & optional secondary AHB clocks
104 * @num_clks: Count of clock names
105 */
106 struct geni_se_desc {
107 unsigned int num_clks;
108 const char * const *clks;
109 };
110
111 static const char * const icc_path_names[] = {"qup-core", "qup-config",
112 "qup-memory"};
113
114 #define QUP_HW_VER_REG 0x4
115
116 /* Common SE registers */
117 #define GENI_INIT_CFG_REVISION 0x0
118 #define GENI_S_INIT_CFG_REVISION 0x4
119 #define GENI_OUTPUT_CTRL 0x24
120 #define GENI_CGC_CTRL 0x28
121 #define GENI_CLK_CTRL_RO 0x60
122 #define GENI_FW_S_REVISION_RO 0x6c
123 #define SE_GENI_BYTE_GRAN 0x254
124 #define SE_GENI_TX_PACKING_CFG0 0x260
125 #define SE_GENI_TX_PACKING_CFG1 0x264
126 #define SE_GENI_RX_PACKING_CFG0 0x284
127 #define SE_GENI_RX_PACKING_CFG1 0x288
128 #define SE_GENI_M_GP_LENGTH 0x910
129 #define SE_GENI_S_GP_LENGTH 0x914
130 #define SE_DMA_TX_PTR_L 0xc30
131 #define SE_DMA_TX_PTR_H 0xc34
132 #define SE_DMA_TX_ATTR 0xc38
133 #define SE_DMA_TX_LEN 0xc3c
134 #define SE_DMA_TX_IRQ_EN 0xc48
135 #define SE_DMA_TX_IRQ_EN_SET 0xc4c
136 #define SE_DMA_TX_IRQ_EN_CLR 0xc50
137 #define SE_DMA_TX_LEN_IN 0xc54
138 #define SE_DMA_TX_MAX_BURST 0xc5c
139 #define SE_DMA_RX_PTR_L 0xd30
140 #define SE_DMA_RX_PTR_H 0xd34
141 #define SE_DMA_RX_ATTR 0xd38
142 #define SE_DMA_RX_LEN 0xd3c
143 #define SE_DMA_RX_IRQ_EN 0xd48
144 #define SE_DMA_RX_IRQ_EN_SET 0xd4c
145 #define SE_DMA_RX_IRQ_EN_CLR 0xd50
146 #define SE_DMA_RX_LEN_IN 0xd54
147 #define SE_DMA_RX_MAX_BURST 0xd5c
148 #define SE_DMA_RX_FLUSH 0xd60
149 #define SE_GSI_EVENT_EN 0xe18
150 #define SE_IRQ_EN 0xe1c
151 #define SE_DMA_GENERAL_CFG 0xe30
152
153 /* GENI_OUTPUT_CTRL fields */
154 #define DEFAULT_IO_OUTPUT_CTRL_MSK GENMASK(6, 0)
155
156 /* GENI_CGC_CTRL fields */
157 #define CFG_AHB_CLK_CGC_ON BIT(0)
158 #define CFG_AHB_WR_ACLK_CGC_ON BIT(1)
159 #define DATA_AHB_CLK_CGC_ON BIT(2)
160 #define SCLK_CGC_ON BIT(3)
161 #define TX_CLK_CGC_ON BIT(4)
162 #define RX_CLK_CGC_ON BIT(5)
163 #define EXT_CLK_CGC_ON BIT(6)
164 #define PROG_RAM_HCLK_OFF BIT(8)
165 #define PROG_RAM_SCLK_OFF BIT(9)
166 #define DEFAULT_CGC_EN GENMASK(6, 0)
167
168 /* SE_GSI_EVENT_EN fields */
169 #define DMA_RX_EVENT_EN BIT(0)
170 #define DMA_TX_EVENT_EN BIT(1)
171 #define GENI_M_EVENT_EN BIT(2)
172 #define GENI_S_EVENT_EN BIT(3)
173
174 /* SE_IRQ_EN fields */
175 #define DMA_RX_IRQ_EN BIT(0)
176 #define DMA_TX_IRQ_EN BIT(1)
177 #define GENI_M_IRQ_EN BIT(2)
178 #define GENI_S_IRQ_EN BIT(3)
179
180 /* SE_DMA_GENERAL_CFG */
181 #define DMA_RX_CLK_CGC_ON BIT(0)
182 #define DMA_TX_CLK_CGC_ON BIT(1)
183 #define DMA_AHB_SLV_CFG_ON BIT(2)
184 #define AHB_SEC_SLV_CLK_CGC_ON BIT(3)
185 #define DUMMY_RX_NON_BUFFERABLE BIT(4)
186 #define RX_DMA_ZERO_PADDING_EN BIT(5)
187 #define RX_DMA_IRQ_DELAY_MSK GENMASK(8, 6)
188 #define RX_DMA_IRQ_DELAY_SHFT 6
189
190 /**
191 * geni_se_get_qup_hw_version() - Read the QUP wrapper Hardware version
192 * @se: Pointer to the corresponding serial engine.
193 *
194 * Return: Hardware Version of the wrapper.
195 */
geni_se_get_qup_hw_version(struct geni_se * se)196 u32 geni_se_get_qup_hw_version(struct geni_se *se)
197 {
198 struct geni_wrapper *wrapper = se->wrapper;
199
200 return readl_relaxed(wrapper->base + QUP_HW_VER_REG);
201 }
202 EXPORT_SYMBOL(geni_se_get_qup_hw_version);
203
geni_se_io_set_mode(void __iomem * base)204 static void geni_se_io_set_mode(void __iomem *base)
205 {
206 u32 val;
207
208 val = readl_relaxed(base + SE_IRQ_EN);
209 val |= GENI_M_IRQ_EN | GENI_S_IRQ_EN;
210 val |= DMA_TX_IRQ_EN | DMA_RX_IRQ_EN;
211 writel_relaxed(val, base + SE_IRQ_EN);
212
213 val = readl_relaxed(base + SE_GENI_DMA_MODE_EN);
214 val &= ~GENI_DMA_MODE_EN;
215 writel_relaxed(val, base + SE_GENI_DMA_MODE_EN);
216
217 writel_relaxed(0, base + SE_GSI_EVENT_EN);
218 }
219
geni_se_io_init(void __iomem * base)220 static void geni_se_io_init(void __iomem *base)
221 {
222 u32 val;
223
224 val = readl_relaxed(base + GENI_CGC_CTRL);
225 val |= DEFAULT_CGC_EN;
226 writel_relaxed(val, base + GENI_CGC_CTRL);
227
228 val = readl_relaxed(base + SE_DMA_GENERAL_CFG);
229 val |= AHB_SEC_SLV_CLK_CGC_ON | DMA_AHB_SLV_CFG_ON;
230 val |= DMA_TX_CLK_CGC_ON | DMA_RX_CLK_CGC_ON;
231 writel_relaxed(val, base + SE_DMA_GENERAL_CFG);
232
233 writel_relaxed(DEFAULT_IO_OUTPUT_CTRL_MSK, base + GENI_OUTPUT_CTRL);
234 writel_relaxed(FORCE_DEFAULT, base + GENI_FORCE_DEFAULT_REG);
235 }
236
geni_se_irq_clear(struct geni_se * se)237 static void geni_se_irq_clear(struct geni_se *se)
238 {
239 writel_relaxed(0, se->base + SE_GSI_EVENT_EN);
240 writel_relaxed(0xffffffff, se->base + SE_GENI_M_IRQ_CLEAR);
241 writel_relaxed(0xffffffff, se->base + SE_GENI_S_IRQ_CLEAR);
242 writel_relaxed(0xffffffff, se->base + SE_DMA_TX_IRQ_CLR);
243 writel_relaxed(0xffffffff, se->base + SE_DMA_RX_IRQ_CLR);
244 writel_relaxed(0xffffffff, se->base + SE_IRQ_EN);
245 }
246
247 /**
248 * geni_se_init() - Initialize the GENI serial engine
249 * @se: Pointer to the concerned serial engine.
250 * @rx_wm: Receive watermark, in units of FIFO words.
251 * @rx_rfr: Ready-for-receive watermark, in units of FIFO words.
252 *
253 * This function is used to initialize the GENI serial engine, configure
254 * receive watermark and ready-for-receive watermarks.
255 */
geni_se_init(struct geni_se * se,u32 rx_wm,u32 rx_rfr)256 void geni_se_init(struct geni_se *se, u32 rx_wm, u32 rx_rfr)
257 {
258 u32 val;
259
260 geni_se_irq_clear(se);
261 geni_se_io_init(se->base);
262 geni_se_io_set_mode(se->base);
263
264 writel_relaxed(rx_wm, se->base + SE_GENI_RX_WATERMARK_REG);
265 writel_relaxed(rx_rfr, se->base + SE_GENI_RX_RFR_WATERMARK_REG);
266
267 val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
268 val |= M_COMMON_GENI_M_IRQ_EN;
269 writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
270
271 val = readl_relaxed(se->base + SE_GENI_S_IRQ_EN);
272 val |= S_COMMON_GENI_S_IRQ_EN;
273 writel_relaxed(val, se->base + SE_GENI_S_IRQ_EN);
274 }
275 EXPORT_SYMBOL(geni_se_init);
276
geni_se_select_fifo_mode(struct geni_se * se)277 static void geni_se_select_fifo_mode(struct geni_se *se)
278 {
279 u32 proto = geni_se_read_proto(se);
280 u32 val, val_old;
281
282 geni_se_irq_clear(se);
283
284 /* UART driver manages enabling / disabling interrupts internally */
285 if (proto != GENI_SE_UART) {
286 /* Non-UART use only primary sequencer so dont bother about S_IRQ */
287 val_old = val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
288 val |= M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN;
289 val |= M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN;
290 if (val != val_old)
291 writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
292 }
293
294 val_old = val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
295 val &= ~GENI_DMA_MODE_EN;
296 if (val != val_old)
297 writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
298 }
299
geni_se_select_dma_mode(struct geni_se * se)300 static void geni_se_select_dma_mode(struct geni_se *se)
301 {
302 u32 proto = geni_se_read_proto(se);
303 u32 val, val_old;
304
305 geni_se_irq_clear(se);
306
307 /* UART driver manages enabling / disabling interrupts internally */
308 if (proto != GENI_SE_UART) {
309 /* Non-UART use only primary sequencer so dont bother about S_IRQ */
310 val_old = val = readl_relaxed(se->base + SE_GENI_M_IRQ_EN);
311 val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN);
312 val &= ~(M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
313 if (val != val_old)
314 writel_relaxed(val, se->base + SE_GENI_M_IRQ_EN);
315 }
316
317 val_old = val = readl_relaxed(se->base + SE_GENI_DMA_MODE_EN);
318 val |= GENI_DMA_MODE_EN;
319 if (val != val_old)
320 writel_relaxed(val, se->base + SE_GENI_DMA_MODE_EN);
321 }
322
geni_se_select_gpi_mode(struct geni_se * se)323 static void geni_se_select_gpi_mode(struct geni_se *se)
324 {
325 u32 val;
326
327 geni_se_irq_clear(se);
328
329 writel(0, se->base + SE_IRQ_EN);
330
331 val = readl(se->base + SE_GENI_M_IRQ_EN);
332 val &= ~(M_CMD_DONE_EN | M_TX_FIFO_WATERMARK_EN |
333 M_RX_FIFO_WATERMARK_EN | M_RX_FIFO_LAST_EN);
334 writel(val, se->base + SE_GENI_M_IRQ_EN);
335
336 writel(GENI_DMA_MODE_EN, se->base + SE_GENI_DMA_MODE_EN);
337
338 val = readl(se->base + SE_GSI_EVENT_EN);
339 val |= (DMA_RX_EVENT_EN | DMA_TX_EVENT_EN | GENI_M_EVENT_EN | GENI_S_EVENT_EN);
340 writel(val, se->base + SE_GSI_EVENT_EN);
341 }
342
343 /**
344 * geni_se_select_mode() - Select the serial engine transfer mode
345 * @se: Pointer to the concerned serial engine.
346 * @mode: Transfer mode to be selected.
347 */
geni_se_select_mode(struct geni_se * se,enum geni_se_xfer_mode mode)348 void geni_se_select_mode(struct geni_se *se, enum geni_se_xfer_mode mode)
349 {
350 WARN_ON(mode != GENI_SE_FIFO && mode != GENI_SE_DMA && mode != GENI_GPI_DMA);
351
352 switch (mode) {
353 case GENI_SE_FIFO:
354 geni_se_select_fifo_mode(se);
355 break;
356 case GENI_SE_DMA:
357 geni_se_select_dma_mode(se);
358 break;
359 case GENI_GPI_DMA:
360 geni_se_select_gpi_mode(se);
361 break;
362 case GENI_SE_INVALID:
363 default:
364 break;
365 }
366 }
367 EXPORT_SYMBOL(geni_se_select_mode);
368
369 /**
370 * DOC: Overview
371 *
372 * GENI FIFO packing is highly configurable. TX/RX packing/unpacking consist
373 * of up to 4 operations, each operation represented by 4 configuration vectors
374 * of 10 bits programmed in GENI_TX_PACKING_CFG0 and GENI_TX_PACKING_CFG1 for
375 * TX FIFO and in GENI_RX_PACKING_CFG0 and GENI_RX_PACKING_CFG1 for RX FIFO.
376 * Refer to below examples for detailed bit-field description.
377 *
378 * Example 1: word_size = 7, packing_mode = 4 x 8, msb_to_lsb = 1
379 *
380 * +-----------+-------+-------+-------+-------+
381 * | | vec_0 | vec_1 | vec_2 | vec_3 |
382 * +-----------+-------+-------+-------+-------+
383 * | start | 0x6 | 0xe | 0x16 | 0x1e |
384 * | direction | 1 | 1 | 1 | 1 |
385 * | length | 6 | 6 | 6 | 6 |
386 * | stop | 0 | 0 | 0 | 1 |
387 * +-----------+-------+-------+-------+-------+
388 *
389 * Example 2: word_size = 15, packing_mode = 2 x 16, msb_to_lsb = 0
390 *
391 * +-----------+-------+-------+-------+-------+
392 * | | vec_0 | vec_1 | vec_2 | vec_3 |
393 * +-----------+-------+-------+-------+-------+
394 * | start | 0x0 | 0x8 | 0x10 | 0x18 |
395 * | direction | 0 | 0 | 0 | 0 |
396 * | length | 7 | 6 | 7 | 6 |
397 * | stop | 0 | 0 | 0 | 1 |
398 * +-----------+-------+-------+-------+-------+
399 *
400 * Example 3: word_size = 23, packing_mode = 1 x 32, msb_to_lsb = 1
401 *
402 * +-----------+-------+-------+-------+-------+
403 * | | vec_0 | vec_1 | vec_2 | vec_3 |
404 * +-----------+-------+-------+-------+-------+
405 * | start | 0x16 | 0xe | 0x6 | 0x0 |
406 * | direction | 1 | 1 | 1 | 1 |
407 * | length | 7 | 7 | 6 | 0 |
408 * | stop | 0 | 0 | 1 | 0 |
409 * +-----------+-------+-------+-------+-------+
410 *
411 */
412
413 #define NUM_PACKING_VECTORS 4
414 #define PACKING_START_SHIFT 5
415 #define PACKING_DIR_SHIFT 4
416 #define PACKING_LEN_SHIFT 1
417 #define PACKING_STOP_BIT BIT(0)
418 #define PACKING_VECTOR_SHIFT 10
419 /**
420 * geni_se_config_packing() - Packing configuration of the serial engine
421 * @se: Pointer to the concerned serial engine
422 * @bpw: Bits of data per transfer word.
423 * @pack_words: Number of words per fifo element.
424 * @msb_to_lsb: Transfer from MSB to LSB or vice-versa.
425 * @tx_cfg: Flag to configure the TX Packing.
426 * @rx_cfg: Flag to configure the RX Packing.
427 *
428 * This function is used to configure the packing rules for the current
429 * transfer.
430 */
geni_se_config_packing(struct geni_se * se,int bpw,int pack_words,bool msb_to_lsb,bool tx_cfg,bool rx_cfg)431 void geni_se_config_packing(struct geni_se *se, int bpw, int pack_words,
432 bool msb_to_lsb, bool tx_cfg, bool rx_cfg)
433 {
434 u32 cfg0, cfg1, cfg[NUM_PACKING_VECTORS] = {0};
435 int len;
436 int temp_bpw = bpw;
437 int idx_start = msb_to_lsb ? bpw - 1 : 0;
438 int idx = idx_start;
439 int idx_delta = msb_to_lsb ? -BITS_PER_BYTE : BITS_PER_BYTE;
440 int ceil_bpw = ALIGN(bpw, BITS_PER_BYTE);
441 int iter = (ceil_bpw * pack_words) / BITS_PER_BYTE;
442 int i;
443
444 if (iter <= 0 || iter > NUM_PACKING_VECTORS)
445 return;
446
447 for (i = 0; i < iter; i++) {
448 len = min_t(int, temp_bpw, BITS_PER_BYTE) - 1;
449 cfg[i] = idx << PACKING_START_SHIFT;
450 cfg[i] |= msb_to_lsb << PACKING_DIR_SHIFT;
451 cfg[i] |= len << PACKING_LEN_SHIFT;
452
453 if (temp_bpw <= BITS_PER_BYTE) {
454 idx = ((i + 1) * BITS_PER_BYTE) + idx_start;
455 temp_bpw = bpw;
456 } else {
457 idx = idx + idx_delta;
458 temp_bpw = temp_bpw - BITS_PER_BYTE;
459 }
460 }
461 cfg[iter - 1] |= PACKING_STOP_BIT;
462 cfg0 = cfg[0] | (cfg[1] << PACKING_VECTOR_SHIFT);
463 cfg1 = cfg[2] | (cfg[3] << PACKING_VECTOR_SHIFT);
464
465 if (tx_cfg) {
466 writel_relaxed(cfg0, se->base + SE_GENI_TX_PACKING_CFG0);
467 writel_relaxed(cfg1, se->base + SE_GENI_TX_PACKING_CFG1);
468 }
469 if (rx_cfg) {
470 writel_relaxed(cfg0, se->base + SE_GENI_RX_PACKING_CFG0);
471 writel_relaxed(cfg1, se->base + SE_GENI_RX_PACKING_CFG1);
472 }
473
474 /*
475 * Number of protocol words in each FIFO entry
476 * 0 - 4x8, four words in each entry, max word size of 8 bits
477 * 1 - 2x16, two words in each entry, max word size of 16 bits
478 * 2 - 1x32, one word in each entry, max word size of 32 bits
479 * 3 - undefined
480 */
481 if (pack_words || bpw == 32)
482 writel_relaxed(bpw / 16, se->base + SE_GENI_BYTE_GRAN);
483 }
484 EXPORT_SYMBOL(geni_se_config_packing);
485
geni_se_clks_off(struct geni_se * se)486 static void geni_se_clks_off(struct geni_se *se)
487 {
488 struct geni_wrapper *wrapper = se->wrapper;
489
490 clk_disable_unprepare(se->clk);
491 clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
492 }
493
494 /**
495 * geni_se_resources_off() - Turn off resources associated with the serial
496 * engine
497 * @se: Pointer to the concerned serial engine.
498 *
499 * Return: 0 on success, standard Linux error codes on failure/error.
500 */
geni_se_resources_off(struct geni_se * se)501 int geni_se_resources_off(struct geni_se *se)
502 {
503 int ret;
504
505 if (has_acpi_companion(se->dev))
506 return 0;
507
508 ret = pinctrl_pm_select_sleep_state(se->dev);
509 if (ret)
510 return ret;
511
512 geni_se_clks_off(se);
513 return 0;
514 }
515 EXPORT_SYMBOL(geni_se_resources_off);
516
geni_se_clks_on(struct geni_se * se)517 static int geni_se_clks_on(struct geni_se *se)
518 {
519 int ret;
520 struct geni_wrapper *wrapper = se->wrapper;
521
522 ret = clk_bulk_prepare_enable(wrapper->num_clks, wrapper->clks);
523 if (ret)
524 return ret;
525
526 ret = clk_prepare_enable(se->clk);
527 if (ret)
528 clk_bulk_disable_unprepare(wrapper->num_clks, wrapper->clks);
529 return ret;
530 }
531
532 /**
533 * geni_se_resources_on() - Turn on resources associated with the serial
534 * engine
535 * @se: Pointer to the concerned serial engine.
536 *
537 * Return: 0 on success, standard Linux error codes on failure/error.
538 */
geni_se_resources_on(struct geni_se * se)539 int geni_se_resources_on(struct geni_se *se)
540 {
541 int ret;
542
543 if (has_acpi_companion(se->dev))
544 return 0;
545
546 ret = geni_se_clks_on(se);
547 if (ret)
548 return ret;
549
550 ret = pinctrl_pm_select_default_state(se->dev);
551 if (ret)
552 geni_se_clks_off(se);
553
554 return ret;
555 }
556 EXPORT_SYMBOL(geni_se_resources_on);
557
558 /**
559 * geni_se_clk_tbl_get() - Get the clock table to program DFS
560 * @se: Pointer to the concerned serial engine.
561 * @tbl: Table in which the output is returned.
562 *
563 * This function is called by the protocol drivers to determine the different
564 * clock frequencies supported by serial engine core clock. The protocol
565 * drivers use the output to determine the clock frequency index to be
566 * programmed into DFS.
567 *
568 * Return: number of valid performance levels in the table on success,
569 * standard Linux error codes on failure.
570 */
geni_se_clk_tbl_get(struct geni_se * se,unsigned long ** tbl)571 int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl)
572 {
573 long freq = 0;
574 int i;
575
576 if (se->clk_perf_tbl) {
577 *tbl = se->clk_perf_tbl;
578 return se->num_clk_levels;
579 }
580
581 se->clk_perf_tbl = devm_kcalloc(se->dev, MAX_CLK_PERF_LEVEL,
582 sizeof(*se->clk_perf_tbl),
583 GFP_KERNEL);
584 if (!se->clk_perf_tbl)
585 return -ENOMEM;
586
587 for (i = 0; i < MAX_CLK_PERF_LEVEL; i++) {
588 freq = clk_round_rate(se->clk, freq + 1);
589 if (freq <= 0 || freq == se->clk_perf_tbl[i - 1])
590 break;
591 se->clk_perf_tbl[i] = freq;
592 }
593 se->num_clk_levels = i;
594 *tbl = se->clk_perf_tbl;
595 return se->num_clk_levels;
596 }
597 EXPORT_SYMBOL(geni_se_clk_tbl_get);
598
599 /**
600 * geni_se_clk_freq_match() - Get the matching or closest SE clock frequency
601 * @se: Pointer to the concerned serial engine.
602 * @req_freq: Requested clock frequency.
603 * @index: Index of the resultant frequency in the table.
604 * @res_freq: Resultant frequency of the source clock.
605 * @exact: Flag to indicate exact multiple requirement of the requested
606 * frequency.
607 *
608 * This function is called by the protocol drivers to determine the best match
609 * of the requested frequency as provided by the serial engine clock in order
610 * to meet the performance requirements.
611 *
612 * If we return success:
613 * - if @exact is true then @res_freq / <an_integer> == @req_freq
614 * - if @exact is false then @res_freq / <an_integer> <= @req_freq
615 *
616 * Return: 0 on success, standard Linux error codes on failure.
617 */
geni_se_clk_freq_match(struct geni_se * se,unsigned long req_freq,unsigned int * index,unsigned long * res_freq,bool exact)618 int geni_se_clk_freq_match(struct geni_se *se, unsigned long req_freq,
619 unsigned int *index, unsigned long *res_freq,
620 bool exact)
621 {
622 unsigned long *tbl;
623 int num_clk_levels;
624 int i;
625 unsigned long best_delta;
626 unsigned long new_delta;
627 unsigned int divider;
628
629 num_clk_levels = geni_se_clk_tbl_get(se, &tbl);
630 if (num_clk_levels < 0)
631 return num_clk_levels;
632
633 if (num_clk_levels == 0)
634 return -EINVAL;
635
636 best_delta = ULONG_MAX;
637 for (i = 0; i < num_clk_levels; i++) {
638 divider = DIV_ROUND_UP(tbl[i], req_freq);
639 new_delta = req_freq - tbl[i] / divider;
640 if (new_delta < best_delta) {
641 /* We have a new best! */
642 *index = i;
643 *res_freq = tbl[i];
644
645 /* If the new best is exact then we're done */
646 if (new_delta == 0)
647 return 0;
648
649 /* Record how close we got */
650 best_delta = new_delta;
651 }
652 }
653
654 if (exact)
655 return -EINVAL;
656
657 return 0;
658 }
659 EXPORT_SYMBOL(geni_se_clk_freq_match);
660
661 #define GENI_SE_DMA_DONE_EN BIT(0)
662 #define GENI_SE_DMA_EOT_EN BIT(1)
663 #define GENI_SE_DMA_AHB_ERR_EN BIT(2)
664 #define GENI_SE_DMA_EOT_BUF BIT(0)
665
666 /**
667 * geni_se_tx_init_dma() - Initiate TX DMA transfer on the serial engine
668 * @se: Pointer to the concerned serial engine.
669 * @iova: Mapped DMA address.
670 * @len: Length of the TX buffer.
671 *
672 * This function is used to initiate DMA TX transfer.
673 */
geni_se_tx_init_dma(struct geni_se * se,dma_addr_t iova,size_t len)674 void geni_se_tx_init_dma(struct geni_se *se, dma_addr_t iova, size_t len)
675 {
676 u32 val;
677
678 val = GENI_SE_DMA_DONE_EN;
679 val |= GENI_SE_DMA_EOT_EN;
680 val |= GENI_SE_DMA_AHB_ERR_EN;
681 writel_relaxed(val, se->base + SE_DMA_TX_IRQ_EN_SET);
682 writel_relaxed(lower_32_bits(iova), se->base + SE_DMA_TX_PTR_L);
683 writel_relaxed(upper_32_bits(iova), se->base + SE_DMA_TX_PTR_H);
684 writel_relaxed(GENI_SE_DMA_EOT_BUF, se->base + SE_DMA_TX_ATTR);
685 writel(len, se->base + SE_DMA_TX_LEN);
686 }
687 EXPORT_SYMBOL(geni_se_tx_init_dma);
688
689 /**
690 * geni_se_tx_dma_prep() - Prepare the serial engine for TX DMA transfer
691 * @se: Pointer to the concerned serial engine.
692 * @buf: Pointer to the TX buffer.
693 * @len: Length of the TX buffer.
694 * @iova: Pointer to store the mapped DMA address.
695 *
696 * This function is used to prepare the buffers for DMA TX.
697 *
698 * Return: 0 on success, standard Linux error codes on failure.
699 */
geni_se_tx_dma_prep(struct geni_se * se,void * buf,size_t len,dma_addr_t * iova)700 int geni_se_tx_dma_prep(struct geni_se *se, void *buf, size_t len,
701 dma_addr_t *iova)
702 {
703 struct geni_wrapper *wrapper = se->wrapper;
704
705 if (!wrapper)
706 return -EINVAL;
707
708 *iova = dma_map_single(wrapper->dev, buf, len, DMA_TO_DEVICE);
709 if (dma_mapping_error(wrapper->dev, *iova))
710 return -EIO;
711
712 geni_se_tx_init_dma(se, *iova, len);
713 return 0;
714 }
715 EXPORT_SYMBOL(geni_se_tx_dma_prep);
716
717 /**
718 * geni_se_rx_init_dma() - Initiate RX DMA transfer on the serial engine
719 * @se: Pointer to the concerned serial engine.
720 * @iova: Mapped DMA address.
721 * @len: Length of the RX buffer.
722 *
723 * This function is used to initiate DMA RX transfer.
724 */
geni_se_rx_init_dma(struct geni_se * se,dma_addr_t iova,size_t len)725 void geni_se_rx_init_dma(struct geni_se *se, dma_addr_t iova, size_t len)
726 {
727 u32 val;
728
729 val = GENI_SE_DMA_DONE_EN;
730 val |= GENI_SE_DMA_EOT_EN;
731 val |= GENI_SE_DMA_AHB_ERR_EN;
732 writel_relaxed(val, se->base + SE_DMA_RX_IRQ_EN_SET);
733 writel_relaxed(lower_32_bits(iova), se->base + SE_DMA_RX_PTR_L);
734 writel_relaxed(upper_32_bits(iova), se->base + SE_DMA_RX_PTR_H);
735 /* RX does not have EOT buffer type bit. So just reset RX_ATTR */
736 writel_relaxed(0, se->base + SE_DMA_RX_ATTR);
737 writel(len, se->base + SE_DMA_RX_LEN);
738 }
739 EXPORT_SYMBOL(geni_se_rx_init_dma);
740
741 /**
742 * geni_se_rx_dma_prep() - Prepare the serial engine for RX DMA transfer
743 * @se: Pointer to the concerned serial engine.
744 * @buf: Pointer to the RX buffer.
745 * @len: Length of the RX buffer.
746 * @iova: Pointer to store the mapped DMA address.
747 *
748 * This function is used to prepare the buffers for DMA RX.
749 *
750 * Return: 0 on success, standard Linux error codes on failure.
751 */
geni_se_rx_dma_prep(struct geni_se * se,void * buf,size_t len,dma_addr_t * iova)752 int geni_se_rx_dma_prep(struct geni_se *se, void *buf, size_t len,
753 dma_addr_t *iova)
754 {
755 struct geni_wrapper *wrapper = se->wrapper;
756
757 if (!wrapper)
758 return -EINVAL;
759
760 *iova = dma_map_single(wrapper->dev, buf, len, DMA_FROM_DEVICE);
761 if (dma_mapping_error(wrapper->dev, *iova))
762 return -EIO;
763
764 geni_se_rx_init_dma(se, *iova, len);
765 return 0;
766 }
767 EXPORT_SYMBOL(geni_se_rx_dma_prep);
768
769 /**
770 * geni_se_tx_dma_unprep() - Unprepare the serial engine after TX DMA transfer
771 * @se: Pointer to the concerned serial engine.
772 * @iova: DMA address of the TX buffer.
773 * @len: Length of the TX buffer.
774 *
775 * This function is used to unprepare the DMA buffers after DMA TX.
776 */
geni_se_tx_dma_unprep(struct geni_se * se,dma_addr_t iova,size_t len)777 void geni_se_tx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
778 {
779 struct geni_wrapper *wrapper = se->wrapper;
780
781 if (!dma_mapping_error(wrapper->dev, iova))
782 dma_unmap_single(wrapper->dev, iova, len, DMA_TO_DEVICE);
783 }
784 EXPORT_SYMBOL(geni_se_tx_dma_unprep);
785
786 /**
787 * geni_se_rx_dma_unprep() - Unprepare the serial engine after RX DMA transfer
788 * @se: Pointer to the concerned serial engine.
789 * @iova: DMA address of the RX buffer.
790 * @len: Length of the RX buffer.
791 *
792 * This function is used to unprepare the DMA buffers after DMA RX.
793 */
geni_se_rx_dma_unprep(struct geni_se * se,dma_addr_t iova,size_t len)794 void geni_se_rx_dma_unprep(struct geni_se *se, dma_addr_t iova, size_t len)
795 {
796 struct geni_wrapper *wrapper = se->wrapper;
797
798 if (!dma_mapping_error(wrapper->dev, iova))
799 dma_unmap_single(wrapper->dev, iova, len, DMA_FROM_DEVICE);
800 }
801 EXPORT_SYMBOL(geni_se_rx_dma_unprep);
802
geni_icc_get(struct geni_se * se,const char * icc_ddr)803 int geni_icc_get(struct geni_se *se, const char *icc_ddr)
804 {
805 int i, err;
806 const char *icc_names[] = {"qup-core", "qup-config", icc_ddr};
807
808 if (has_acpi_companion(se->dev))
809 return 0;
810
811 for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
812 if (!icc_names[i])
813 continue;
814
815 se->icc_paths[i].path = devm_of_icc_get(se->dev, icc_names[i]);
816 if (IS_ERR(se->icc_paths[i].path))
817 goto err;
818 }
819
820 return 0;
821
822 err:
823 err = PTR_ERR(se->icc_paths[i].path);
824 if (err != -EPROBE_DEFER)
825 dev_err_ratelimited(se->dev, "Failed to get ICC path '%s': %d\n",
826 icc_names[i], err);
827 return err;
828
829 }
830 EXPORT_SYMBOL(geni_icc_get);
831
geni_icc_set_bw(struct geni_se * se)832 int geni_icc_set_bw(struct geni_se *se)
833 {
834 int i, ret;
835
836 for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
837 ret = icc_set_bw(se->icc_paths[i].path,
838 se->icc_paths[i].avg_bw, se->icc_paths[i].avg_bw);
839 if (ret) {
840 dev_err_ratelimited(se->dev, "ICC BW voting failed on path '%s': %d\n",
841 icc_path_names[i], ret);
842 return ret;
843 }
844 }
845
846 return 0;
847 }
848 EXPORT_SYMBOL(geni_icc_set_bw);
849
geni_icc_set_tag(struct geni_se * se,u32 tag)850 void geni_icc_set_tag(struct geni_se *se, u32 tag)
851 {
852 int i;
853
854 for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++)
855 icc_set_tag(se->icc_paths[i].path, tag);
856 }
857 EXPORT_SYMBOL(geni_icc_set_tag);
858
859 /* To do: Replace this by icc_bulk_enable once it's implemented in ICC core */
geni_icc_enable(struct geni_se * se)860 int geni_icc_enable(struct geni_se *se)
861 {
862 int i, ret;
863
864 for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
865 ret = icc_enable(se->icc_paths[i].path);
866 if (ret) {
867 dev_err_ratelimited(se->dev, "ICC enable failed on path '%s': %d\n",
868 icc_path_names[i], ret);
869 return ret;
870 }
871 }
872
873 return 0;
874 }
875 EXPORT_SYMBOL(geni_icc_enable);
876
geni_icc_disable(struct geni_se * se)877 int geni_icc_disable(struct geni_se *se)
878 {
879 int i, ret;
880
881 for (i = 0; i < ARRAY_SIZE(se->icc_paths); i++) {
882 ret = icc_disable(se->icc_paths[i].path);
883 if (ret) {
884 dev_err_ratelimited(se->dev, "ICC disable failed on path '%s': %d\n",
885 icc_path_names[i], ret);
886 return ret;
887 }
888 }
889
890 return 0;
891 }
892 EXPORT_SYMBOL(geni_icc_disable);
893
geni_se_probe(struct platform_device * pdev)894 static int geni_se_probe(struct platform_device *pdev)
895 {
896 struct device *dev = &pdev->dev;
897 struct geni_wrapper *wrapper;
898 int ret;
899
900 wrapper = devm_kzalloc(dev, sizeof(*wrapper), GFP_KERNEL);
901 if (!wrapper)
902 return -ENOMEM;
903
904 wrapper->dev = dev;
905 wrapper->base = devm_platform_ioremap_resource(pdev, 0);
906 if (IS_ERR(wrapper->base))
907 return PTR_ERR(wrapper->base);
908
909 if (!has_acpi_companion(&pdev->dev)) {
910 const struct geni_se_desc *desc;
911 int i;
912
913 desc = device_get_match_data(&pdev->dev);
914 if (!desc)
915 return -EINVAL;
916
917 wrapper->num_clks = min_t(unsigned int, desc->num_clks, MAX_CLKS);
918
919 for (i = 0; i < wrapper->num_clks; ++i)
920 wrapper->clks[i].id = desc->clks[i];
921
922 ret = of_count_phandle_with_args(dev->of_node, "clocks", "#clock-cells");
923 if (ret < 0) {
924 dev_err(dev, "invalid clocks property at %pOF\n", dev->of_node);
925 return ret;
926 }
927
928 if (ret < wrapper->num_clks) {
929 dev_err(dev, "invalid clocks count at %pOF, expected %d entries\n",
930 dev->of_node, wrapper->num_clks);
931 return -EINVAL;
932 }
933
934 ret = devm_clk_bulk_get(dev, wrapper->num_clks, wrapper->clks);
935 if (ret) {
936 dev_err(dev, "Err getting clks %d\n", ret);
937 return ret;
938 }
939 }
940
941 dev_set_drvdata(dev, wrapper);
942 dev_dbg(dev, "GENI SE Driver probed\n");
943 return devm_of_platform_populate(dev);
944 }
945
946 static const char * const qup_clks[] = {
947 "m-ahb",
948 "s-ahb",
949 };
950
951 static const struct geni_se_desc qup_desc = {
952 .clks = qup_clks,
953 .num_clks = ARRAY_SIZE(qup_clks),
954 };
955
956 static const char * const i2c_master_hub_clks[] = {
957 "s-ahb",
958 };
959
960 static const struct geni_se_desc i2c_master_hub_desc = {
961 .clks = i2c_master_hub_clks,
962 .num_clks = ARRAY_SIZE(i2c_master_hub_clks),
963 };
964
965 static const struct of_device_id geni_se_dt_match[] = {
966 { .compatible = "qcom,geni-se-qup", .data = &qup_desc },
967 { .compatible = "qcom,geni-se-i2c-master-hub", .data = &i2c_master_hub_desc },
968 {}
969 };
970 MODULE_DEVICE_TABLE(of, geni_se_dt_match);
971
972 static struct platform_driver geni_se_driver = {
973 .driver = {
974 .name = "geni_se_qup",
975 .of_match_table = geni_se_dt_match,
976 },
977 .probe = geni_se_probe,
978 };
979 module_platform_driver(geni_se_driver);
980
981 MODULE_DESCRIPTION("GENI Serial Engine Driver");
982 MODULE_LICENSE("GPL v2");
983
